Hey guys ive recently purchased a crow cam tx2 for my VLT and i got it 2nd hand, now im just wondering ive heard some people have to machine their lifter blocks and some havent so im quite unsure as to which it is. Do i have to or dont i?

Correct me if im wrong, But you machine your lifter blocks if you get i.e n/a cam reground, then you get lifter blocks machined to suite. Double check with your cam that you dont need heavy duty valve springs.

but if im installing this cam with standard n/a lifter blocks wouldnt i need them machined to suit. Yes good point, do i need heavy duty valve springs aswell if anyone can help me?

Not sure how to work it out if you can get an idea of the catalogue, http://www.crowcams.com.au/media/cat...N%20PATROL.pdf (http://www.crowcams.com.au/media/catalogues/41.0%20NISSAN%20PATROL.pdf) Call up outlaws or something let them know what model number cam you have, then ask what model number is the springs to suite. I have a 503txm, and i needed heavy duty valve springs, so i would def say you do. I dont know the reason behind it, so hopefully someone can answer your question, but as far as i know, the lifter blocks only get machine if you do a regrind as i mentioned. Its the cheaper way of going about it without buying a straight out cam like you are. Therefore they dont need to be machined.

what markings are on your cam? Mine has, CROW FDA3 221 504 and thats all? if that helps anyone else out aswell?

if it is a tx2 yes they will have to be machined 100%

I got a Brand new TX2 from Crow, Valve springs from them also to match. Asked about Lifter blocks. No, dont need them.

I was under the impression you only had to do the lifter blocks for regrinds?

Quote: Originally Posted by PSI086 I was under the impression you only had to do the lifter blocks for regrinds? at least we have a winner, the reason for "machining" the lifter blokes is due to the reduced base circle of your org. cam, eg standard turbo/n/a into something more "intresting" when ground to get that more fun profile X amount of material has to be removed in the correct area. my n/a regrind was around 130 and to have the lifter blocks machined " 0.25" " removed was around $80 for the set and another 80 odd to get the lifters faced

Quote: Originally Posted by Tomo at least we have a winner, the reason for "machining" the lifter blokes is due to the reduced base circle of your org. cam, eg standard turbo/n/a into something more "intresting" when ground to get that more fun profile X amount of material has to be removed in the correct area. my n/a regrind was around 130 and to have the lifter blocks machined " 0.25" " removed was around $80 for the set and another 80 odd to get the lifters faced 100% correct only the solids are new billets is why they are so much dearer

Too true must machine lifter blocks . I got the same cam and i rang crow n thay said for sure you have too .I took it out because it wouldent idle good then i was told i would need to remap or get an aftermarket ecu . Have you got an aftermarket ecu cause im interested too see if you have the same problem ......